What hiking topo maps should I buy in order to hike in US (e. g. Yosemite, Grand Canyon, Yellowstone and other national parks)?
Is National Geographics maps the only available up-to-date option? Do they offer full US coverage? USGS seems to be a bit outdated to me, right?
Are there any online/mobile apps options or do I need to buy just the printed one once in US?
The United States Geological Survey has free, downloadable and current topo maps. From its site:
"US Topo maps are produced by the USGS National Geospatial Technical Operations Center. The first 3-year production cycle for the conterminous 48 states was completed in September 2012, and the second in September 2015."
A great resource is Andrew Skurka, described as "adventurer, guide, speaker, writer." A visit to his site should have everything you need to know for your upcoming travels, and more.
Happy trails to you.
